199478388579 has 16 divisors (see below), whose sum is σ = 267689201664. Its totient is φ = 132128280000.

The previous prime is 199478388523. The next prime is 199478388617. The reversal of 199478388579 is 975883874991.

It is not a de Polignac number, because 199478388579 - 2⁸ = 199478388323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199478381579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260079 + ... + 683079.

It is an arithmetic number, because the mean of its divisors is an integer number (16730575104).

Almost surely, 2^199478388579 is an apocalyptic number.

199478388579 is a deficient number, since it is larger than the sum of its proper divisors (68210813085).

199478388579 is a wasteful number, since it uses less digits than its factorization.

199478388579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424018.

The product of its digits is 1097349120, while the sum is 78.

The spelling of 199478388579 in words is "one hundred ninety-nine billion, four hundred seventy-eight million, three hundred eighty-eight thousand, five hundred seventy-nine".